Method of and apparatus for passing threads into fabrics



Oct. 11, 1927. 1,645 257 R. ROSSMANN METHOD OF AND APPARATUS FOR PASSING THREADS INTO FABRICS Filed May 24. 1926 2 Shoots-Shoot 2 Fig.4

,4 vvvvvuvvvvvv Patented Oct. 11, 1927.

UNITED STATES PATENT OFFICE.

RUDOLF ROSSMANN, 0F GRUNBERG, GERMANY, ASSIGNOR TO DEUTSCHE WOLLEN- PORATION 0F GERMANY.

METHOD OF AND APPARATUS FOR PASSING THREADS INTO FABRICS.

Application filed May'24, 1926, Serial No. 111,300, and in Germany May 30, 1925.

My invention relates to improvements in the method of and apparatus for passing threads into fabrics for mending defective parts thereof, or producing a pattern thereon. More particularly my invention relates to mechanical darning means for passing darning threads through a fabric. The object of the improvements is to provide an apparatus which is simple in construction and reliable in operation and with this object in view my invention consists in providing a relatively fixed needle and means for feeding the fabric thereto while reciprocating the same transversely of the needle.

For the purpose of explaining the invention an apparatus suitable for putting the method into efi'ect has been illustrated in the accompanying drawings, in which the same letters of reference have been used in all the views to indicate corresponding parts.

In said drawings Fig. 1 is an elevation partly in section showing the main parts of the machine,

Fig. 2 is a top plan view of- Fig. l, with the presser mechanism removed,

Fig. 3 is a sectional elevation taken on the line 3-3 of Fig. 1. r

Fig. 4 shows a part of a. fabric having a defective portion,

Fig. 5 is a sectional view taken on the line 55 of Fig. 4,

Fig. 6 is a sectional elevation of a part of the apparatus shown in Fig. 1 and having a fabric placed thereon,

Fig. 7 is a similar sectional elevation showing the parts in different positions,

Figs. 8 to 12 are sectional detail views showing the needle and a part of the fabric in different steps of the operation,

Fig. 13 is a sectional view showing the mended fabric,

Fig. 14 is a sectional view illustrating a modification of the improved method, and

Fig. 15 is a diagrammatical elevation showing another modification.

In describing the invention I shall make reference onlyto the main parts of the machine. The driving mechanism for the said parts has not been illustrated because my invention does not specifically relate thereto, and an expert will readily be able to provide suitable driving mechanism for the operative parts.

In the example shown in Figs. 1 to 3 my improved apparatus comprises a table hav ing a lower or front part a and an elevated rear part b, the said parts being connected by an inclined part 0. The rear part b is formed with a recess e having a pair of feed dogs 2' and j disposed therein, which feed dogs are connected Wit-h suitable mechanism adapted to impart thereto oscillating movement for intermittently advancing the fabric from the left to the right. Above the rear part b of the table there is a presser mechanism which, as shown, comprises one or more spring pressed plates 71. mounted on an arm 9 of the machine and adapted to co-operate with the feed dogs 71 and j in the manner known in the art. The part b of the table is formed with a longitudinal groove 0 adapted to have a'needle d placed therein. which needle is provided at its rear end with an eye g for receiving a thread 1'. The feed dogs are likewise formed with a groove is having the needle d embedded therein. The needle is supported with its rear end on the rear wall 7 of the groove 0 which acts as an abutment. I

The front part a of the table is formed with a recess 8 in which a plunger n has reciprocating movement, which plunger 00- operates wit-h a lunger m located above the same and guide in the arm 9, the object of the said plungers being to impart reciprocating upward and downward the fabric Z held between the same. The front end of the presser plate or plates 71. extends forwardly beyond the feed dog 2' and to the corner formed by the parts 6 and 0 of the table, the said corner and the front ed e of the plate It providing a pair of jaws for holding the fabric 1 when moving the same upwardly or downwardly by means of the plungers n and m and stitching the needle therethrough.

The operation of the machine is as follows:

It may be assumed that a linen fabric shown in Fig. 4' is to be mended in which one of the weft threads p is torn. The fabric is placed on the portion a of the table and bemovement to I tween the plungers m and n thereof, and it is passed over the needle and between the presser plate h and the feed dogs '5 and 7' so that the. rear end of the defective portion. 0 is located in front of the point of the needle. Now the machine is set into operation. The feed dogs 2', j engage the part of the fabric located atthe sides of the needle and pull the same rearwardly a distance corresponddistance between successive weft Thus the point of the needle ing to the threads.

stitches through the fabric from the bottom side thereof, as is indicated in Fig. 6. Thereafter-.the plungers m, n elevate the fabric into the position shown in Fig. 7 the fabric bein swung around the point of the needle. At t e end of the upward movement of the fabric the feed dogs advance the same another step thus stitching the needle through the fabrlc from the top face thereof. as is shown in Figp8. Thereafter the fabric is again moved downwardly and around the point of the needle, as is shown in Fig. 9, whereupon it is advanced towards the needle which therefore stitches throu h the fabric from the bottom side thereo as is shown in Fig. 10; The same operations are repeated, another intermediate step being illustrated in Fig. 11, until finally the defective part of the fabric is threaded on the needle in the form of a plait, whereupon the needle is pulled forwardly for drawing in i I the thread. Fig. 13'shows themended fabric and the thread 1*.

feeds, one of .For inserting a thread into a fabric having an irregular tie, in which for example the thread passes above one thread and thereafter below three threads, as is shown in Fig. 14, the feed dogs must be operated with varying feed. In some cases the feed dogs 1' and are operated with different the sald dogs advancing the fabric a distance corresponding to two threads, and the other advancing the same a distance corresponding to three threads. For regularly passing the thread over two or 1 more transverse threads, for example alternately over and below two threads, as is shown in Fig. '15, the feed dogs have a regular feed corresponding to the distance between the threads. If-the faultof the fab ,ric is so long that a needle is not suflicient for'mending the same in one operation, the needle is passed several times through the fabric. a

In the example shown in Figs. 1 to 3, the

reser mechanism is located above the feed ogs. But I wish it tobe understood that I do not limit myself to this feature. I may use any known or preferred feeding mechanism, for example a combined presser and feeding mechanism such as are Enown in sewing machines. Further, I do not limit myself to a construction in which the parts a and b of the table are disposed i difierent planes. IVhen disposing the said parts in the same planeI provide the table between the plungersm, n and the feed dogs with a recess.

It will be understood that my improved method may be generally used for stitching threads into fabrics of various kinds either for improving the quality of the fabric, or for producing a particular, effect, or for making embroidery work thereon. For ex ample by means of my improved apparatus the threads may be stitched in a fabric diagonall of the warp and weft threads.

1. The method of stitching thread into fabrics;which comprises feeding the fabric intermittently onto a stationary threadedneedle and alternately shiftin the fabric to opposite sides of the needle uring inter- {3. A machine of the class described, com-. prising a table, an abutment thereon, a

needle held stationary by said abutment, means for intermittently feeding a fabric longitudinally of the needle, and separate means for reciprocating the fabric transverselv of the needle". p

4. A machine of the class described, comprising a'table adapted to have a stationary needle thereon, means for. intermittently feeding afabric longitudinal] of the needle, and means for reciprocatin t e fabric transversely of the needle, w ile the feeding movement is interrupted.

5. A machine of the class described, comprising a table having a groove therein, a needle in the groove, means for intermittentl feeding a fabric longitudinally of the n e, and a pair of reciprocating lungers located in advance of the needle'an adapted to reciprocate the fabric transversely of the needl i 6. A machine of the class described, comprising a. table having a recess and a groove crossing the said recess and a needle held therein, a feed dog arranged to intermittently feed the fabric mounted within said recess and formed with a groove in alignment with said groove of the table, yieldm presser mechanism co-operating wi h said dog, a pair of reciprocating grippers coated in advance of said needle and to grip the fabric, and reciprocate it transversely of the needle, the operations of said feed dog and grip ers being timed to alternately perform the ieeding and reciprocating movements.

7. A machine of the class described, comprising a table formed with a transverse corner and a recess at the rear of said corner, a needle crossing said recess and having its point above said corner, a feed dog within said recess; a yieldingvpresser plate 10 In testimony whereof I hereunto aflix my 15 signature.

RUDOLF RossM ANN. 

